The BMW R 45, a diminutive yet potent addition to the German marque’s storied lineup of air-cooled twins. Born from the same DNA as its larger brethren, the R 45 shares the same unmistakable boxer twin heartbeat, but with a more agile and approachable demeanor.
Its 439cc engine produces a lively 32 horsepower, propelling the lightweight R 45 to a respectable 80mph top speed with ease. The smaller displacement and more compact frame make it an ideal choice for riders seeking a more manageable and flickable mount.
As a result, the R 45 rewards its rider with a thrilling, accessible riding experience that’s as much at home on twisty back roads as it is in the daily commute.
Key Specifications
Engine Type
Four stroke, two cylinder horizontally opposed Boxer, pushrod operated 2 valves per cylinder.
Engine Capacity
453 cc / 27.6 cu in.
Max Power
20 kw / 27 hp
Max Torque
37.5 Nm / 3.82 kgf-m / 27.65 lb-ft @ 5000 rpm
Fuel Tank Capacity
5.8 US gallons / 22.0 L
*n/a – information not provided by manufacturer
All Specifications
Make & Model
Model
BMW R 45
Year
1980 –
Engine
Engine Type
Four stroke, two cylinder horizontally opposed Boxer, pushrod operated 2 valves per cylinder.
Displacement
453 cc / 27.6 cu in.
Bore x Stroke
70 x 61.5 mm
Compression Ratio
9.2:1
Max Horsepower
20 kw / 27 hp
Max Torque
37.5 Nm / 3.82 kgf-m / 27.65 lb-ft @ 5000 rpm
Engine Management System
2 x Bing V65 carburetors
Cooling System
Air cooled
Performance
Top Speed
n/a
*n/a – information not provided by manufacturer
Transmission
Gearbox
5 Speed
Final Drive
Shaft
Electrical & Electronics System
Starter
Kick
Chassis & Suspension
Front Suspension
Telescopic hydraulic forks
Front Suspension Travel
175 mm / 6.9″
Rear Suspension
Long swinging arm with adjustable strut
Wheels & Brakes
Front Tire Size
1.85 – B18
Rear Tire Size
2.50 – B18
Front Brakes
2 x 260mm Disc, 2 piston caliper.
Rear Brakes
Single 200mm drum
Dimension & Weights
Fuel Tank Capacity
5.8 US gallons / 22.0 L
Dry Weight
185 kg / 408 lbs
Know someone who’d find this useful? Share this page with a friend, your riding club or your favourite motorcycle community.
Explore our collection of BMW motorcycles for detailed specifications and model information. Or browse all motorcycle manufacturers.
*We strive to provide the most comprehensive and accurate specifications possible. However, certain details may not be available if the manufacturer did not disclose them or if the information is no longer publicly accessible. If you find any discrepancy with any data on this site, please feel free to let us know at contact@throttlecraze.com
